{"product_id":"biasi-antares-25c-high-efficiency-condensing-combi-boiler-25kw-with-horizontal-flue-kit","title":"Biasi Antares 25C High Efficiency Condensing Combi Boiler 25kW with Horizontal Flue Kit","description":"\u003cdiv style=\"font-size:16px;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;max-width:900px;margin:0 auto;color:#1a1a1a;line-height:1.65;\"\u003e\n\n  \u003c!-- Intro --\u003e\n  \u003cp style=\"margin:0 0 18px;\"\u003eThe \u003cstrong\u003eBiasi Antares 25C\u003c\/strong\u003e is Biasi's \u003cstrong\u003eflagship wall-hung condensing combi boiler\u003c\/strong\u003e, delivering \u003cstrong\u003e25 kW\u003c\/strong\u003e of heating and instantaneous domestic hot water output. Manufactured at Biasi's advanced Italian facility — where every unit is individually tested before leaving the production line — the Antares represents the pinnacle of the Biasi domestic boiler family. It features a \u003cstrong\u003e1:21 modulation ratio\u003c\/strong\u003e, a fully \u003cstrong\u003eplastic-free brass hydraulic group\u003c\/strong\u003e, \u003cstrong\u003eGrundfos ErP-rated circulating pump\u003c\/strong\u003e, \u003cstrong\u003eAdaptive Gas Technology\u003c\/strong\u003e (NG \/ LPG \/ 20% Hydrogen Ready), and a large \u003cstrong\u003emultifunctional touch-sensitive display\u003c\/strong\u003e. This pack pairs the boiler with the \u003cstrong\u003eBiasi Horizontal Flue Kit (Ø 60\/100 mm)\u003c\/strong\u003e for a standard wall-exit installation. The Antares 25C carries an \u003cstrong\u003eErP Energy Class A\u003c\/strong\u003e rating as standard — upgradable to \u003cstrong\u003eA+\u003c\/strong\u003e with the optional iControl weather-compensation system — and is backed by \u003cstrong\u003eup to 10 years warranty\u003c\/strong\u003e (with Biasi Filter or Pro-Fit accreditation).\u003c\/p\u003e\n\n  \u003c!-- Stat strip --\u003e\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;margin:0 0 22px;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 14px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e25 kW\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;opacity:.9;\"\u003eHeat Output\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 14px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e1:21\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;opacity:.9;\"\u003eModulation Ratio\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 14px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e12.9 L\/min\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;opacity:.9;\"\u003eDHW Flow (ΔT 30K)\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 14px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e94%\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;opacity:.9;\"\u003eErP Efficiency ηs\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 14px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e10 Yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;opacity:.9;\"\u003eMax Warranty*\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 14px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e20% H₂\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;opacity:.9;\"\u003eHydrogen Ready\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Warning --\u003e\n  \u003cdiv style=\"background:#fff4f4;border-left:4px solid #cc2222;border-radius:4px;padding:13px 16px;margin:0 0 14px;\"\u003e\n    \u003cstrong style=\"color:#cc2222;\"\u003eInstallation — Gas Safe Engineer Required.\u003c\/strong\u003e This appliance must be installed and commissioned by a \u003cstrong\u003eGas Safe Registered Engineer\u003c\/strong\u003e in accordance with current Gas Safety (Installation \u0026amp; Use) Regulations, BS 7671, and the Biasi installation manual. LPG conversion and gas-type changes must only be performed by a competent engineer using the on-board CAF calibration function.\n  \u003c\/div\u003e\n\n  \u003c!-- Advisory --\u003e\n  \u003cdiv style=\"background:#fffbf0;border-left:4px solid #e09000;border-radius:4px;padding:13px 16px;margin:0 0 14px;\"\u003e\n    \u003cstrong style=\"color:#b06800;\"\u003eHorizontal Flue — Max 10 m (Ø 60\/100 coaxial).\u003c\/strong\u003e The included horizontal flue kit provides a direct through-wall exit. Each 45° elbow deducts 0.5 m and each 90° elbow deducts 1 m from the 10 m maximum. For installations requiring a larger offset or central boiler alignment, the \u003cstrong\u003eBiasi Offset Flue Adaptor (10999.1492.0)\u003c\/strong\u003e is available — no reduction in maximum flue length. The Antares is also compatible with C13, C33, C43\/C53\/C83\/C93, B23P, and C63 flue configurations.\n  \u003c\/div\u003e\n\n  \u003c!-- Info --\u003e\n  \u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;border-radius:4px;padding:13px 16px;margin:0 0 22px;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003ePack Contents:\u003c\/strong\u003e Biasi Antares 25C combi boiler + Horizontal Flue Kit (Ø 60\/100 mm, Part No. 10999.0387.1). The boiler ships with all isolation valves with pre-formed copper pipes, condensate drain adaptor, wall mounting plate, paper template, power supply cable, user\/installation\/service manual, and warranty documentation. \u003cstrong\u003e*10-year warranty requires fitting of Biasi magnetic filter or Pro-Fit accreditation; standard warranty 2 years.\u003c\/strong\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Feature cards --\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin:0 0 26px;\"\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003e1:21 Modulation Ratio\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eWith a \u003cstrong\u003e1:21 turn-down ratio\u003c\/strong\u003e, the Antares can operate at as little as 1\/21st of its maximum output — ideal for well-insulated properties and underfloor heating systems with very low heat loss. \u003cstrong\u003eReduced cycling, quieter operation, and a longer boiler life\u003c\/strong\u003e are the direct benefits of this industry-leading modulation range.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003eAdaptive Gas Technology\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003eeGarc electronic combustion management system\u003c\/strong\u003e continuously reads the flame signal and adjusts gas valve and fan output to maintain optimum CO₂ levels. \u003cstrong\u003eOne model covers Natural Gas, LPG, and up to 20% hydrogen blends\u003c\/strong\u003e — no hardware changes required for gas-type conversion.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003ePlastic-Free Brass Hydraulic Group\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe Antares uses a \u003cstrong\u003efully brass hydraulic unit\u003c\/strong\u003e — replacing the plastic components found in older designs. Brass is completely recyclable, more durable under pressure cycling, and significantly reduces the risk of stress fractures over the boiler's working life. This is a key differentiator versus many competitor models.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003eStainless Steel AISI 441 Heat Exchanger\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003eseamless single-coil primary heat exchanger in stainless steel AISI 441\u003c\/strong\u003e offers high-temperature strength combined with superior corrosion resistance. Its large oval-section geometry promotes constant water flow, \u003cstrong\u003eprevents debris accumulation\u003c\/strong\u003e, reduces friction losses, and makes flushing easy. The coil count is sized to the boiler output (10.5 coils for the 25C).\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003eGrundfos ErP Circulating Pump\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003eGrundfos UPM4 7.5 m head ErP pump\u003c\/strong\u003e uses PWM technology to generate precisely the correct flow for prevailing demand. Features include an \u003cstrong\u003eintegrated air purge, built-in drain tap, and manual pump unlock\u003c\/strong\u003e — simplifying commissioning and servicing. High performance combined with low standby consumption meets current EuP\/ErP requirements.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003eMultifunctional Touch Display\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe large \u003cstrong\u003ebacklit LCD touch interface\u003c\/strong\u003e simultaneously displays live system pressure, DHW set temperature, CH set temperature, and primary circuit temperature. The \u003cstrong\u003etouch-sensitive control buttons\u003c\/strong\u003e navigate Summer\/Winter\/Off modes, DHW and CH adjustment, and the full programming menu including Chimney Sweep, Calibration, Fault History, and the annual service reminder countdown.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003eClapet Non-Return Valve\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe Antares is \u003cstrong\u003esupplied as standard with a Clapet non-return valve\u003c\/strong\u003e in the flue circuit, enabling simplified connection to pressurised collective flue systems in accordance with UNI 7129. The damper opens automatically under fan pressure during operation and closes at rest to prevent back-flow of combustion products in shared flue scenarios.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003e10-Litre Expansion Vessel\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003e10-litre expansion vessel\u003c\/strong\u003e (cold pre-charge 1 bar) accommodates systems up to 124 litres total water content, covering the majority of domestic heating installations without the need for an additional external vessel. The vessel is \u003cstrong\u003eside-mounted and easily accessible\u003c\/strong\u003e for re-pressurisation or replacement during service.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #dde8e7;border-radius:6px;padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;text-decoration:underline;text-underline-offset:4px;\"\u003eA+\/A Energy Class \u0026amp; Wi-Fi Ready\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe Antares achieves \u003cstrong\u003eErP Energy Class A\u003c\/strong\u003e as supplied and \u003cstrong\u003eA+ when paired with the optional iControl weather-compensation kit\u003c\/strong\u003e (advanced control + external probe + WFC01 app). Wi-Fi connectivity via the \u003cstrong\u003eBiasi App\u003c\/strong\u003e enables remote temperature control, real-time monitoring, and instant fault-code notification.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- Spec table --\u003e\n  \u003cp style=\"font-weight:700;font-size:16px;margin:0 0 8px;color:#005c54;\"\u003eTechnical Specifications — Biasi Antares 25C\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;margin:0 0 26px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;width:55%;\"\u003eNominal heat input — heating \/ DHW\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e21.0 \/ 26.0 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMinimum heat input — heating \/ DHW\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e2.6 \/ 2.6 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMax usable power 60°\/80°C (heating \/ DHW)\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e20.7 \/ 25.6 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMin usable power 60°\/80°C\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e2.5 \/ 2.5 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMax usable power 30°\/50°C (condensing)\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e22.8 \/ 28.2 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMin usable power 30°\/50°C\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e2.7 \/ 2.7 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eEfficiency nom. 60°\/80°C\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e98.5 %\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eEfficiency nom. 30°\/50°C\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e108.7 %\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eEfficiency at 30% load (30°\/50°C)\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e109.9 %\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eErP seasonal efficiency ηs\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e94 %\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eDHW flow rate ΔT 25K \/ ΔT 35K\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e15.4 \/ 10.7 L\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eSpecific DHW flow rate ΔT 30K (EN 625)\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e12.9 L\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMin \/ Max DHW temperature\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e30 \/ 60 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMin \/ Max DHW pressure\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e0.5 \/ 10.0 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMin \/ Max CH temperature\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e25 \/ 85 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMin \/ Max CH pressure\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e0.3 \/ 3.0 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eAvailable pump head (at 1000 L\/h)\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e350 mbar\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eExpansion vessel capacity\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e10 litres (pre-charge 1 bar, max system 124 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eNOx class \/ weighted NOx\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003eClass 6 \/ 42 mg\/kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eModulation ratio\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e1:21\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003ePump model\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003eGrundfos UPM4 (7.5 m head, ErP)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eVoltage \/ power at nominal input\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e230 V~ \/ 94 W\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eStand-by power draw\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e4 W\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eIngress protection\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003eIPX5D\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMax coaxial flue length Ø 60\/100 mm\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e10 m\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMax coaxial flue length Ø 80\/125 mm\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e12 m\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eMax twin flue length Ø 80+80 mm\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e40 m\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eCompatible flue configurations\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003eC13, C33, C43\/C53\/C83\/C93, B23P, C63\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eDimensions H × W × D\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e700 × 400 × 300 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e31.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eWater content\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e2.0 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eGas type\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003eNatural Gas G20 \/ LPG G31 \/ 20% H₂ blend\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n\u003ctd style=\"padding:7px 10px;font-weight:600;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;\"\u003e2 years standard; up to 10 years with Biasi Filter or Pro-Fit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003c!-- FAQs --\u003e\n  \u003cp style=\"font-weight:700;font-size:16px;margin:0 0 10px;color:#005c54;\"\u003eFrequently Asked Questions\u003c\/p\u003e\n\n  \u003cdetails style=\"border:1px solid #dde8e7;border-radius:6px;margin-bottom:8px;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:11px 15px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat makes the Antares different from the Biasi Dina?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:13px 15px;font-size:15px;\"\u003eThe Antares is Biasi's \u003cstrong\u003etop-of-range domestic boiler\u003c\/strong\u003e and builds on the Dina platform with several key upgrades: a \u003cstrong\u003e1:21 modulation ratio\u003c\/strong\u003e (vs 1:5 on the Dina), a \u003cstrong\u003e10-litre expansion vessel\u003c\/strong\u003e (vs 7 L), the \u003cstrong\u003eGrundfos ErP pump\u003c\/strong\u003e, a \u003cstrong\u003efully brass hydraulic group\u003c\/strong\u003e, a \u003cstrong\u003eClapet non-return valve\u003c\/strong\u003e as standard, and a larger higher-max CH temperature range of 85°C. The Antares also has a wider flue compatibility range and supports \u003cstrong\u003eup to 10 years warranty\u003c\/strong\u003e.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #dde8e7;border-radius:6px;margin-bottom:8px;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:11px 15px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eHow do I qualify for the 10-year warranty?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:13px 15px;font-size:15px;\"\u003eThe \u003cstrong\u003e10-year warranty\u003c\/strong\u003e requires either the installation of a \u003cstrong\u003eBiasi magnetic filter\u003c\/strong\u003e on the system or the installer holding \u003cstrong\u003ePro-Fit accreditation\u003c\/strong\u003e. Annual servicing by a Gas Safe Registered Engineer is required to maintain the warranty throughout the extended period. The standard warranty without these conditions is 2 years.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #dde8e7;border-radius:6px;margin-bottom:8px;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:11px 15px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs the Antares suitable for underfloor heating systems?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:13px 15px;font-size:15px;\"\u003eYes — the \u003cstrong\u003e1:21 modulation ratio\u003c\/strong\u003e makes the Antares particularly well suited to underfloor heating, where low flow temperatures (typically 35–45°C) are required and precise modulation is critical to avoid overheating. When paired with an \u003cstrong\u003eexternal weather-compensation probe\u003c\/strong\u003e, the boiler continuously adjusts its flow temperature to match the actual heat demand, maximising efficiency and occupant comfort.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #dde8e7;border-radius:6px;margin-bottom:8px;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:11px 15px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat fault codes does the Antares display and can I read them remotely?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:13px 15px;font-size:15px;\"\u003eThe Antares stores the \u003cstrong\u003elast 10 fault codes\u003c\/strong\u003e in its on-board Fault History menu, each time-stamped and accessible via the control panel under the main menu. Fault codes E01–E99 plus L1 cover ignition lockouts, probe failures, pressure faults, fan anomalies, and gas valve issues. When connected to \u003cstrong\u003eBiasi Connect Wi-Fi\u003c\/strong\u003e, fault notifications are also pushed to the user's smartphone in real time.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #dde8e7;border-radius:6px;margin-bottom:8px;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:11px 15px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eCan the Antares connect to a third-party smart thermostat?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:13px 15px;font-size:15px;\"\u003eYes. The Antares accepts a \u003cstrong\u003evolt-free room thermostat\u003c\/strong\u003e connection between terminals A and B (remove the bridge link when connecting any external control). The boiler is also compatible with \u003cstrong\u003eOpenTherm-class controls\u003c\/strong\u003e when used with an appropriate interface. The E1–E2 terminals accept an \u003cstrong\u003eexternal temperature probe\u003c\/strong\u003e for weather compensation. Refer to the installation manual panel connection diagram for full wiring details.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #dde8e7;border-radius:6px;margin-bottom:8px;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:11px 15px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat is the automatic calibration (CAF) function?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:13px 15px;font-size:15px;\"\u003eThe \u003cstrong\u003eFast Calibration (CAF) function\u003c\/strong\u003e is accessed via General Settings → Access Level (code 6683) → Service → Assistance → Special Functions. It takes approximately 4 minutes to run and electronically calibrates the gas valve for the current supply gas, ensuring optimal combustion without requiring a flue analyser in routine gas-type changes. It should also be run after replacing the gas valve or main PCB.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Biasi","offers":[{"title":"Default Title","offer_id":64860022014301,"sku":"Antares25H","price":950.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/BiasiAntaresHighEfficiencyCondensingCombiBoilerwithHorizontalFlueKit.jpg?v=1780334336","url":"https:\/\/qualityheating.co.uk\/products\/biasi-antares-25c-high-efficiency-condensing-combi-boiler-25kw-with-horizontal-flue-kit","provider":"AIZO Quality Heating","version":"1.0","type":"link"}